Position a rack in the upper third of the oven and preheat the oven to 350 degrees.
2
Slice the tops off of the tomatoes (save the tops for garnish later). Hollow out the cavities of the tomatoes by gently squeezing them and using your pinky finger.
3
Salt and pepper the inside of the tomatoes and put them on a rack, upside down, with paper towels below, to shed some water.
4
To prepare the bread crumbs: slice a day old ciabatta loaf lengthwise (so the slices can fit into the mouth of your food processor), using the steel blade attachment process the bread lengths until nicely "crumbed".
5
Thoroughly mix the pesto in with 1-1/2 cups of breadcrumbs.
6
Using a small spoon and your fingers, stuff the tomato cavities with the bread crumb mixture.
7
Place the tomatoes in a baking container. Drizzle the tops of each of the tomatoes with olive oil.
8
Place in the heated oven and bake for 40 minutes. When finished, the tomatoes should be soft but not collapsing. The bread crumbs should have a golden brown crust.